These are statistically significantly different from zero for all models, which implies that unobserved heterogeneity in terms of household specific fixed effects--capturing, for example, assortative mating and access to social and professional networks--are important for wage determination in Thailand.

In "Marry your like: assortative mating and income inequality" (National Bureau of Economic Research working paper 19829, January 2014), authors Jeremy Greenwood, Nezih Guner, Georgi Kocharkov, and Cezar Santos find that assortative mating is important for income inequality, and that income inequality in the United States has increased since 1960, in part because of more women entering the workforce.

We present evidence that after 1990 the covariance of spousal earnings switched from negative (or zero) to positive, consistent with assortative matching, and that leads to modest upward pressure on overall income volatility.

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